Re: Drowning in Dark Matter?
- From: Eric Gisse <jowr.pi.nospam@xxxxxxxxxxxxxxxx>
- Date: Thu, 06 Dec 2007 08:43:41 -0900
On Thu, 6 Dec 2007 18:19:52 +0100 (MET), Bruce Scott TOK
<Use-Author-Supplied-Address-Header@[127.1]> wrote:
Eric Gisse wrote:
*scratches head*
Nobody has seen dark matter interact in any way other than
gravitationally! These guys think not only did the dark matter manage
to coalesce - something that we have ALSO not seen - but it apparently
collided with itself and produced heat to keep stars from forming?
The way they used to model it was as pressureless dust. No pressure, no
radiation, etc. Hard to form a star with that setup.
My interpreation was that dark matter mixed in with the baryonic
matter, which then produced collision heat from either self collisions
or collisions with baryonic matter. Since the former process hasn't
been observed and the latter must be very weak at best, I'm somewhat
skeptical.
The pressureless dust model has worked so far, imho.
That's a reach.
Quite.
Though I wouldn't be too skeptical at the idea of a huge pile of dark
matter directly collapsing into the initial black holes that seeded
galaxies...
One has to find a dissipation mechanism first.
True.
As far as I can tell, dark matter doesn't interact with anything
except gravitationally. Though there has been a cluster collision like
the Bullet cluster that suggests there is an interaction with dark
matter and itself, but that was an initial analysis and I still
haven't seen a good followup yet.
.
- References:
- Drowning in Dark Matter?
- From: Sam Wormley
- Re: Drowning in Dark Matter?
- From: Eric Gisse
- Re: Drowning in Dark Matter?
- From: Bruce Scott TOK
- Drowning in Dark Matter?
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